If a ,b ,c ,d are positive real umbers ...

If `a ,b ,c ,d` are positive real umbers such that `a+b+c+d=2`,then `M=(a+b)(c+d)` satisfies the relation (a)`0lt=Mlt=1` (b)`1lt=Mlt=2` (c)`2lt=Mlt=3` (d)`3lt=Mlt=4`

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